I would request people to CLAIM 4 incorrect (ambiguous) questions in JEE Main 11 april.
According to this question paper http://jeemain.nic.in/webinfo/PDF/11April2015.pdf1 Two question of math section namely, 25 and 26 and here is the concrete reason for that (https://www.youtube.com/watch?v=znNnXs1dqps) and (https://www.youtube.com/watch?v=M82ifSbNQ68) Also type in google 'is equilateral triangle isosceles' the very first definition say's it is. And 1 question from chemistry section which I am not yet sure of but I see institute say its wrong, it is ques no 24, here both 1 and 2nd product are form in equal amounts. In question no. 23 Physics section,is definitely wrong and as a concrete proof: http://www.indiapmt.com/download/AIPMT-2011.pdf see question no 24 of physics section, they specifically mention in +z axis. (Now that's a question from big examination and all the questions I have come across specifically mention along +z axis, if they would have said along k^ then it would have been a different case).